James Cook University

About: James Cook University is a education organization based out in Townsville, Queensland, Australia. It is known for research contribution in the topics: Population & Coral reef. The organization has 9101 authors who have published 27750 publications receiving 1032608 citations. The organization is also known as: JCU.

Improving the Performance of the Roundtable on Sustainable Palm Oil for Nature Conservation

Abstract: Oil palm (Elaeis spp.) is one of the world’s most rapidly expanding crops. Especially prevalent in Malaysia and Indonesia, oil-palm plantations are also increasing rapidly across tropical regions as diverse as New Guinea, Equatorial Africa, Central America, and the Amazon (Butler & Laurance 2009; Koh & Wilcove 2009). Oil palm is an important driver of tropical deforestation, in part, because plantation owners often use timber revenues from old-growth forests to subsidize the initial costs of plantation establishment and maintenance (Fitzherbert et al. 2008). Expansion of oil palm imperils both lowland rainforests and peat-swamp forests, which are, respectively, among the biologically richest and most carbon-dense ecosystems on Earth (Butler & Laurance 2009; Koh et al. 2009a). The rapid expansion of oil palm seems likely to continue for many years because of its high profitability and the growing global demands for edible oils and biofuel feedstocks. Proponents of palm oil emphasize that its main alternatives, including soy, sunflower, and canola (rapeseed) oils, have production efficiencies just 10–20% as high as palm oil on a per-hectare basis and would therefore require much larger areas of cultivated land to have a similar benefit (Basiron 2009). Nevertheless, from climate-change and biodiversity perspectives, the advantages of palm-oil production are greatly diminished when it contributes either directly or indirectly to deforestation (Gibbs et al. 2008; Danielsen et al. 2009). Growing concerns about the environmental impacts of palm oil helped initiate the Roundtable on Sustainable Palm Oil (RSPO), a nonprofit, industry-led trade organization whose stated mission is to “provide RSPO-certified palm oil to the market in a clear and transparent manner” and to “promote the growth and use of sustainable palm oil” (www.rspo.org/What_is_RSPO@.aspx). As implied by the word roundtable, the RSPO professes to advocate a balanced, multistakeholder approach, with considerable emphasis on environmental sustainability. According to the RSPO, this is evidenced by the fact that four of the 16 members of its executive board are from conservation or social-developmental organizations. The RSPO also takes pains to draw a distinction between itself and industry-advocacy groups, such as the Malaysian Palm Oil Council and Indonesian Palm Oil Producers Association, by emphasizing its efforts to improve the industry’s sustainability and transparency (V. Rao, personal communication). The RSPO has considerable potential to improve the environmental performance of producers and users of palm oil. Although established only in 2004, it is strategically positioned within the palm-oil industry and is particularly influential in Malaysia. The growing membership of RSPO already accounts for approximately 35% of the global production of palm oil, although only about one tenth of this oil is currently certified as sustainable (RSPO 2008). To define sustainability in the oil-palm sector, the RSPO has developed 39 sustainability criteria, organized under eight general principles, which are designed to limit environmental impacts of growing and processing palm oil. These criteria focus on issues, such as reducing herbicide impacts, air pollution, and losses of biodiversity as well as on social and legal concerns (RSPO 2006). Nevertheless, some environmental organizations have repeatedly criticized the RSPO and its members, particularly for enabling tropical deforestation and atmospheric carbon emissions under the guise of stated, but unfulfilled, sustainability criteria (e.g., Down to Earth 2004; Greenpeace 2008; Maitar 2009). Here, we critique the RSPO from an environmental perspective and identify some specific ways it can become more effective in reducing threats to tropical ecosystems.

Experimental test of the effect of maternal hormones on larval quality of a coral reef fish.

Abstract: Maternal hormones can play an important role in the development of fish larvae. Levels of the stress hormone, cortisol, in females are elevated by social interactions and transferred directly to the yolk of eggs, where they may influence developmental rates. In some vertebrates, prenatal exposure to high levels of testosterone determine early growth rates, social status and reproductive success. The present study examined whether post-fertilization exposure of eggs of the tropical damselfish, Pomacentrus amboinensis (Pomacentridae), to natural levels of cortisol or testosterone directly affects larval morphology at hatching. Maternal and egg levels of cortisol and testosterone varied widely among clutches of eggs from local populations around Lizard Island on the Great Barrier Reef. The morphology of larvae produced by these local fish populations also varied widely and differed significantly among sites (e.g., standard length: 2.6–3.4 mm; yolk sac area: 0.01–0.13 × 10−2 mm2). Laboratory experiments showed that elevated cortisol levels in the egg reduced larval length at hatching, while slight elevations in testosterone increased yolk sac size. The influence of testosterone, and to a smaller extent cortisol, on larval morphology differed among egg clutches. These differences were partly explained by differences in initial egg hormone levels. Morphological changes induced by experimental hormonal regimes encompassed the entire range of variability in body attributes found in field populations. It is unclear whether cortisol influences growth alone or development rate or both. Testosterone appears to influence yolk utilization rates, and has no significant effect on growth, in contrast to its role in later developmental stages. Maternally derived cortisol and testosterone are important in regulating growth, development, and nutritive reserves of the embryo and larvae of this fish species. Factors that influence the maternal levels of cortisol and testosterone may have a major impact on larval mortality schedules and, therefore, on which breeding individuals contribute to the next generation.

Ecology. Global amphibian population declines.

Abstract: The decline and disappearance of relatively undisturbed populations of amphibians in several high-altitude regions since the 1970s suggests that they may have suffered a global decline, perhaps with a common cause or causes¹⁻³. Houlahan et al.⁴ examined means of trends for 936 amphibian populations and concluded that global declines began in the late 1950s, peaked in the 1960s, and have continued at a reduced rate since. Here we re-analyse their data using a method that accounts for the sampling of different populations over different time periods, and find evidence of a mean global decline in monitored populations only in the 1990s. However it is calculated, the global mean not only masks substantial spatial and temporal variation in population trends and sampling effort, but also fails to distinguish between a global decline with global causes and the cumulative effects of local declines with local causes.

Multiple drivers of decline in the global status of freshwater crayfish (Decapoda: Astacidea)

Abstract: Rates of biodiversity loss are higher in freshwater ecosystems than in most terrestrial or marine ecosystems, making freshwater conservation a priority. However, prioritization methods are impeded by insufficient knowledge on the distribution and conservation status of freshwater taxa, particularly invertebrates. We evaluated the extinction risk of the world's 590 freshwater crayfish species using the IUCN Categories and Criteria and found 32% of all species are threatened with extinction. The level of extinction risk differed between families, with proportionally more threatened species in the Parastacidae and Astacidae than in the Cambaridae. Four described species were Extinct and 21% were assessed as Data Deficient. There was geographical variation in the dominant threats affecting the main centres of crayfish diversity. The majority of threatened US and Mexican species face threats associated with urban development, pollution, damming and water management. Conversely, the majority of Australian threatened species are affected by climate change, harvesting, agriculture and invasive species. Only a small proportion of crayfish are found within the boundaries of protected areas, suggesting that alternative means of long-term protection will be required. Our study highlights many of the significant challenges yet to come for freshwater biodiversity unless conservation planning shifts from a reactive to proactive approach.